LT3688
2
3688f
ABSOLUTE MAXIMUM RATINGS
V
IN
, EN/UVLO, CONFIG Voltage (Note 2) ...................36V
BST Voltage ..............................................................55V
BST above SW Voltage .............................................30V
BIAS Voltage .............................................................30V
WDE, WDI, RST, WDO Voltage ...................................6V
FB, RT
, SYNC, RUN/SS Voltage ..................................6V
C
WDT
, C
POR
Voltage ....................................................3V
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
FE PACKAGE
24-LEAD PLASTIC TSSOP
24
23
22
21
20
19
18
17
16
15
14
13
FB1
RUN/SS1
BST1
SW1
DA1
V
IN
CONFIG
DA2
SW2
BST2
RUN/SS2
FB2
EN/UVLO
SYNC
RT
C
WDT
C
POR1
BIAS
C
POR2
WDI
WDE
WDO
RST1
RST2
25
GND
θ
JA
= 38°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE ELECTRICALLY CONNECTED TO PCB
24 23 22 21 20 19
7 8 9
TOP VIEW
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18
RT
SYNC
EN/UVLO
FB1
RUN/SS1
BST1
WDO
RST1
RST2
FB2
RUN/SS2
BST2
C
WDT
C
POR1
BIAS
C
POR2
WDI
WDE
SW1
DA1
V
IN
CONFIG
DA2
SW2
25
GND
θ
JA
= 37°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE ELECTRICALLY CONNECTED TO PCB
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3688EFE#PBF LT3688EFE#TRPBF LT3688FE 24-Lead Plastic TSSOP –40°C to 125°C
LT3688IFE#PBF LT3688IFE#TRPBF LT3688FE 24-Lead Plastic TSSOP –40°C to 125°C
LT3688HFE#PBF LT3688HFE#TRPBF LT3688FE 24-Lead Plastic TSSOP –40°C to 150°C
LT3688EUF#PBF LT3688EUF#TRPBF 3688
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LT3688IUF#PBF LT3688IUF#TRPBF 3688
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi
cations, go to: http://www
.linear.com/tapeandreel/
(Note 1)
Operating Junction Temperature Range (Note 3)
LT3688E, LT3688I ..............................–40°C to 125°C
LT3688H ............................................–40°C to 150°C
Maximum Junction Temperature
LT3688E, LT3688I ............................................. 125°C
LT3688H ........................................................... 150°C
Storage Temperature Range ...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
FE Package ....................................................... 300°C